![]() Vibration-based damage detection techniques are an example of global damage detection techniques. In such cases, global damage detection techniques are necessary. However, in some large and complex structures with inaccessible regions, it is not possible to locate damage using local damage detection techniques. If the potential damage location is already known for testing, then it is called a local damage detection technique. Non-destructive damage detection techniques can also be classified as local and global. The active approaches require sophisticated equipment and less signal processing to detect damage, whereas the passive approaches need more signal processing and less advanced equipment in most of the cases. The passive approaches depend on sensor measurements for the detection of unknown inputs, such as external loads or impacts, environmental factors, and new damage, which causes changes in sensor measurements. The active approaches need an external excitation of the monitored structures, while their responses are measured using sensors. Generally, damage detection techniques can be divided into active and passive approaches. SHM is based on sensing to monitor the behaviour of structures, assess their performance, and identify damage at its early stage. A system that involves observation of the condition of a structure by means of control and measurement in order to detect, locate, identify and predict the development of deformation and damage, which may cause the structure to fail, is called SHM (Structural Health Monitoring). In recent years, various methods of the monitoring of engineering structures have been developed. The answer to the question about the technical condition of the equipment in service is crucial, among other things, for the reasons of operational safety and economic calculations. The inspection of the technical condition of machinery and mechanical components has always been a fundamental part of engineering practice. The numerical analysis has been carried out by the use of the Time-domain Spectral Finite Element Method (TD-SFEM), whereas the experimental part has been based on the measurement performed by 1-D Laser Doppler Scanning Vibrometery (LDSV). This paper discusses the results of research carried out by the authors in this regard both numerically and experimentally. Hence, a question arises about whether it is possible to shorten the required measurement time without affecting the sensitivity of the diagnostic method used. ![]() Diagnostic methods based on the elastic wave propagation phenomenon are becoming more and more popular, therefore it is worth focusing on the improvement of the efficiency of these methods. Recently, methods based on the analysis of changes in dynamic parameters of structures, that is, frequencies or mode shapes of natural vibrations, as well as changes in propagating elastic waves, have been developed at the highest rate. There are many methods of damage detection, in which changes in various parameters caused by the presence of damage are analysed. ![]() Damage detection in structural components, especially in mechanical engineering, is an important element of engineering practice. ![]()
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